EXHIBIT NN

FILING AGREEMENT DATED TO BE EFFECTIVE June 30, 2010

REGARDING JOINT FILING OF SCHEDULE 13D

The undersigned hereby agree that:

(i)

Each is eligible to use the Schedule 13D attached hereto;

(ii)

The attached Schedule 13D is filed on behalf of each of the undersigned; and

(iii)

Each of the undersigned is responsible for the timely filing of such Schedule 13D and any amendments thereto, and for the completeness and accuracy of the information therein concerning itself; but none of them is responsible for the completeness and accuracy if the information concerning the other persons making the filing, unless it knows or has reason to believe that such information is inaccurate.

Sentient USA Resources Fund, L.P.

     By: Sentient Executive MLP1, Limited,

                                     General Partner

By: ____/s/ Greg Link__ _______________

Greg Link, Director

Date: July 7, 2010

Sentient Executive MLP1, Limited,

By:   ___/s/ Greg Link_____________

Greg Link, Director

Date: July 7, 2010

Filing Agreement – June 6, 2008

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